====== NRF SDK5 ======
===== app_timer2 =====
In SDK 16.0.0, app_timer2 is used by default in the examples,
New ram efficient ''app_timer2'' implementation:
#define APP_TIMER_ENABLED 1
#define NRF_SORTLIST_ENABLED 1
$(SDK_ROOT)/components/libraries/atomic_fifo/nrf_atfifo.c \
$(SDK_ROOT)/components/libraries/timer/app_timer2.c \
$(SDK_ROOT)/components/libraries/timer/drv_rtc.c \
$(SDK_ROOT)/components/libraries/sortlist/nrf_sortlist.c \
$(SDK_ROOT)/components/libraries/atomic_fifo \
$(SDK_ROOT)/components/libraries/sortlist \
$(SDK_ROOT)/components/libraries/timer \
APP_CFLAGS += -DAPP_TIMER_V2
APP_CFLAGS += -DAPP_TIMER_V2_RTC1_ENABLED